School of Mathematics and Physics - UQ eSpace
http://espace.library.uq.edu.au/
The University of QueenslandenFez http://blogs.law.harvard.edu/tech/rssA new bound on the size of the largest 2-critical set in a latin square
http://espace.library.uq.edu.au/view/UQ:62496
2007-08-14T17:54:58Z
Cavenagh, N. J. A new cosmological distance measure using active galactic nuclei
http://espace.library.uq.edu.au/view/UQ:262877
2011-12-04T07:57:39Z
Watson, D.; Denney, K. D.; Vestergaard, M.; Davis, T. M. A new diagnostic test for cross-section uncorrelatedness in nonparametric panel data models
http://espace.library.uq.edu.au/view/UQ:285192
In this paper, we propose a new diagnostic test for residual cross-section uncorrelatedness (CU) in a nonparametric panel data model. The proposed nonparametric CU test is a nonparametric counterpart of an existing parametric cross-section dependence test proposed in Pesaran (2004, Cambridge Working paper in Economics 0435). Without assuming cross-section independence, we establish asymptotic distribution for the proposed test statistic for the case where both the cross-section dimension and the time dimension go to infinity simultaneously, and then analyze the power function of the proposed test under a sequence of local alternatives that involve a nonlinear multifactor model. The simulation results and real data analysis show that the nonparametric CU test associated with an asymptotic critical value works well.2012-11-15T11:58:19Z
Chen, Jia; Gao, Jiti; Li, Degui A new diketopyrrolopyrrole-based co-polymer for ambipolar field-effect transistors and solar cells
http://espace.library.uq.edu.au/view/UQ:286241
2012-11-25T00:23:02Z
Tandy, Kristen; Dutta, Gitish K.; Zhang, Yuliang; Venkatramaiah, N.; Aljada, Muhsen; Burn, Paul L.; Meredith, Paul; Namdas, Ebinazar B.; Patil, Satish A new family of N dimensional superintegrable double singular oscillators and quadratic algebra Q(3) ⊕ so(n) ⊕ so(N-n)
http://espace.library.uq.edu.au/view/UQ:373505
2015-11-17T00:31:34Z
Hoque, Md Fazlul; Marquette, Ian; Zhang, Yao-Zhong A new method to create initially mass segregated star clusters in virial equilibrium
http://espace.library.uq.edu.au/view/UQ:265848
2012-01-24T11:50:12Z
Subr, L.; Kroupa, P.; Baumgardt, H. A new preventive maintenance strategy for items sold under warranty
http://espace.library.uq.edu.au/view/UQ:62477
When products are sold under warranty, the manufacturer incurs additional costs for warranty servicing. Preventive maintenance actions can be used to reduce this cost and these are worthwhile only if the extra cost incurred is less than the reduction achieved. In this paper we propose a new preventive maintenance policy where the parameters are selected optimally to minimize the total warranty servicing cost.2007-08-14T17:54:14Z
Jack, N.; Murthy, D. N. P. A new variational Bayesian algorithm with application to human mobility pattern modeling
http://espace.library.uq.edu.au/view/UQ:265957
2012-01-24T14:04:53Z
Wu, Burton; McGrory, Clare A.; Pettitt, Anthony N. An exact lower energy bound for the infinite square well potential
http://espace.library.uq.edu.au/view/UQ:316520
We give a lower bound for the energy of a quantum particle in the infinite square well. We show that the bound is exact and identify the well-known element that fulfils the equality. Our approach is not directly dependent on the Schrödinger equation and illustrates an example where the wavefunction is obtained directly by energy minimization. The derivation presented can serve as an example of a variational method in an undergraduate level university course in quantum mechanics.2013-11-27T17:59:51Z
Ogren, M.; Carlsson, M. An expansion tube study of high enthalpy carbon-dioxide flows
http://espace.library.uq.edu.au/view/UQ:247915
2011-09-08T23:18:55Z
McIntyre, T. J.; Eichmann, T. N.; Lourel, I.; Hajek, K. M.; Rubinsztein-Dunlop, H. An extended regression approach to estimating loads and their uncertainties in Great Barrier Reef catchments
http://espace.library.uq.edu.au/view/UQ:255074
2011-10-12T10:17:02Z
Wang, Y. G.; Kuhnert, P.; Henderson, B.; Stewart, L. An extension of the continual reassessment method using decision theory
http://espace.library.uq.edu.au/view/UQ:222301
The primary goal of a phase I trial is to find the maximally tolerated dose (MTD) of a treatment. The MTD is usually defined in terms of a tolerable probability, q* of toxicity. Our objective is to find the highest dose with toxicity risk that does not exceed q*, a criterion that is often desired in designing phase I trials. This criterion differs from that of finding the dose with toxicity risk closest to q*, that is used in methods such as the continual reassessment method. We use the theory of decision processes to find optimal sequential designs that maximize the expected number of patients within the trial allocated to the highest dose with toxicity not exceeding q*, among the doses under consideration. The proposed method is very general in the sense that criteria other than the one considered here can be optimized and that optimal dose assignment can be defined in terms of patients within or outside the trial. It includes as an important special case the continual reassessment method. Numerical study indicates the strategy compares favourably with other phase I designs.2010-11-24T13:45:47Z
Leung, Denis Heng-Yan; Wang, You-Gan An extravariation model for improving confidence intervals of population size estimates from removal data
http://espace.library.uq.edu.au/view/UQ:221254
2010-11-17T14:08:31Z
Wang, Y. G.; Loneragan, N. R. Angle structures and normal surfaces
http://espace.library.uq.edu.au/view/UQ:262686
Let M be the interior of a compact 3-manifold with boundary, and let T be an ideal triangulation of M. This paper describes necessary and sufficient conditions for the existence of angle structures, semi-angle structures and generalised angle structures on (M; T ) respectively in terms of a generalised Euler characteristic function on the solution space of the normal surface theory of (M; T ). This extends previous work of Kang and Rubinstein, and is itself generalised to a more general setting for 3-dimensional pseudo-manifolds.2011-12-01T14:28:55Z
Luo, Feng; Tillmann, Stephan Angular momentum of a strongly focused Gaussian beam
http://espace.library.uq.edu.au/view/UQ:168942
A circularly polarized paraxial Gaussian laser beam carries ±¯h angular momentum per photon as spin, with zero orbital angular momentum. Focusing the beam with a rotationally symmetric lens cannot change this angular momentum flux, yet the focused beam must have spin |Sz | < ¯h per photon. The remainder of the original spin is converted to orbital angular momentum, manifesting itself as a longitudinal optical vortex at the focus. We investigate the nature of this orbital angular momentum.2009-03-16T15:53:59Z
Nieminen, Timo A.; Stilgoe, Alexander B.; Heckenberg, Norman R.; Rubinsztein-Dunlop, Halina An Hydrophilic Anode Interlayer for Solution Processed Organohalide Perovskite Solar Cells
http://espace.library.uq.edu.au/view/UQ:372361
2015-10-30T10:58:49Z
Lin, Qianqian; Stoltzfus, Dani M.; Armin, Ardalan; Burn, Paul L.; Meredith, Paul An improved Fabens method for estimation of growth parameters in the von Bertalanffy model with individual asymptotes
http://espace.library.uq.edu.au/view/UQ:221234
2010-11-17T13:59:52Z
Wang, Y. G. An inequality relating the circumradius and diameter of two-dimensional lattice-point-free convex bodies
http://espace.library.uq.edu.au/view/UQ:303275
2013-06-20T12:24:25Z
Awyong, Poh Wah An infinite family of superintegrable systems from higher order ladder operators and supersymmetry
http://espace.library.uq.edu.au/view/UQ:259159
We discuss how we can obtain new quantum superintegrable Hamiltonians allowing the separation of variables in Cartesian coordinates with higher order integrals of motion from ladder operators. We also discuss how higher order supersymmetric quantum mechanics can be used to obtain systems with higher order ladder operators and their polynomial Heisenberg algebra. We present a new family of superintegrable systems involving the fifth Painlevé transcendent which possess fourth order ladder operators constructed from second order supersymmetric quantum mechanics. We present the polynomial algebra of this family of superintegrable systems.2011-10-24T14:21:40Z
Marquette, Ian An introduction to balanced sequential arrays on the square grid
http://espace.library.uq.edu.au/view/UQ:201530
2010-04-01T12:34:29Z
Street, Anne Penfold; Nester, Marks R. An introduction to effective low-energy Hamiltonians in condensed matter physics and chemistry
http://espace.library.uq.edu.au/view/UQ:268908
2012-03-05T14:19:44Z
Powell, Ben J. An introduction to quantum optomechanics
http://espace.library.uq.edu.au/view/UQ:269069
We provide an introduction to the description of mechanical systems in the quantum regime, and provide a review of the various types of micro-scale and nano-scale optomechanical and electromechanical systems. The aim is to achieve quantum control of micromechanical and nanomechanical resonators using the electromagnetic field. Such control requires the demonstration of state preparation (in particular, cooling to the ground state), coherent control and quantum-limited measurement. These problems are discussed in turn. Some particular problems in force detection, metrology, nonlinear optomechanics and many-body optomechanics are also discussed.2012-03-06T09:05:18Z
Milburn, G. J.; Woolley, M. J. An inverse theorem for the restricted set addition in Abelian groups
http://espace.library.uq.edu.au/view/UQ:268790
2012-03-02T10:48:25Z
Karolyi, G An investigation of contact transmission of methicillin resistant-Staphylococcus aureus
http://espace.library.uq.edu.au/view/UQ:70005
Hand hygiene is critical in the healthcare setting and it is believed that methicillin-resistant Staphylococcus aureus (MRSA), for example, is transmitted from patient to patient largely via the hands of health professionals. A study has been carried out at a large teaching hospital to estimate how often the gloves of a healthcare worker are contaminated with MRSA after contact with a colonized patient. The effectiveness of handwashing procedures to decontaminate the health professionals' hands was also investigated, together with how well different healthcare professional groups complied with handwashing procedures. The study showed that about 17% (9-25%) of contacts between a healthcare worker and a MRSA-colonized patient results in transmission of MRSA from a patient to the gloves of a healthcare worker. Different health professional groups have different rates of compliance with infection control procedures. Non-contact staff (cleaners, food services) had the shortest handwashing times. In this study, glove use compliance rates were 75% or above in all healthcare worker groups except doctors whose compliance was only 27%. (C) 2004 The Hospital Infection Society. Published by Elsevier Ltd. All rights reserved.2007-08-15T03:28:42Z
McBryde, E. S.; Bradley, L. C.; Whitby, M.; McElwain, D. L. S. An investigation of evaporation from single saline water droplets: experimental and theoretical approaches
http://espace.library.uq.edu.au/view/UQ:350313
2015-02-02T08:48:26Z
Sadafi, M. H.; Jahn, I.; Stilgoe, A. B.; Hooman, K. Anisotropic scattering in angular-dependent magnetoresistance oscillations of quasi-two-dimensional and quasi-one-dimensional metals: Beyond the relaxation-time approximation
http://espace.library.uq.edu.au/view/UQ:173701
The electrical resistivity for a current moving perpendicular to layers (chains) in quasi-two-dimensional (2D) [quasi-one-dimensional (1D)] metals under an applied magnetic field of varying orientation is studied using Boltzmann transport theory. We consider the simplest nontrivial quasi-2D and quasi-1D Fermi surfaces but allow for an arbitrary elastic collision integral (i.e., a scattering probability with arbitrary dependence on momentum transfer) and obtain an expression for the resistivity which generalizes that previously found using a single relaxation-time approximation. The dependence of the resistivity on the angle between the magnetic field and current changes depending on the momentum dependence of the scattering probability. So, whereas zero-field intralayer transport is sensitive only to the momentum-averaged scattering probability (the transport relaxation rate), the resistivity perpendicular to layers measured in a tilted magnetic field provides detailed information about the momentum-dependence of interlayer scattering. These results help us to clarify the meaning of the relaxation rate determined from fits of angular-dependent magnetoresistance oscillations (AMROs) experimental data to theoretical expressions. Furthermore, we suggest how AMRO might be used to probe the dominant scattering mechanism.2009-04-03T13:01:51Z
Smith, M. F.; McKenzie, R. H. Anisotropy-based performance analysis of linear discrete time invariant control systems
http://espace.library.uq.edu.au/view/UQ:1481
2006-04-04T14:01:19Z
Diamond, P; Vladimirov, I; Kurdjukov, A; Semyonov, A Anisotropy in s-wave Bose-Einstein condensate collisions and its relationship to superradiance
http://espace.library.uq.edu.au/view/UQ:341250
2014-10-07T00:19:51Z
Deuar, P.; Jaskula, J.-C.; Bonneau, M.; Krachmalnicoff, V.; Boiron, D.; Westbrook, C. I.; Kheruntsyan, K. V. Annals of Operations Research
http://espace.library.uq.edu.au/view/UQ:190205
2009-12-16T14:14:45ZAnomalous power laws of spectral diffusion in quantum dots: A connection to luminescence intermittency
http://espace.library.uq.edu.au/view/UQ:219909
2010-11-07T00:03:49Z
Plakhotnik, T; Fernee, MJ; Littleton, B; Rubinsztein-Dunlop, H; Potzner, C; Mulvaney, P Anomalous saturation effects due to optical spin depolarization in nitrogen-vacancy centers in diamond nanocrystals
http://espace.library.uq.edu.au/view/UQ:279171
2012-08-19T00:13:20Z
Chapman, Robert; Plakhotnik, Taras A non-Hopfian almost convex group
http://espace.library.uq.edu.au/view/UQ:163835
In this article we prove that an isometric multiple HNN extension of a group satisfying the falsification by fellow traveler property is almost convex. As a corollary, Wise's example of a CAT(0) non-Hopfian group is almost convex.2009-02-11T10:05:37Z
Elder, Murray J. A non-linear numerical model for stratified Tsunami waves and its application
http://espace.library.uq.edu.au/view/UQ:58168
2007-08-14T14:56:08Z
Imteaz, M.; Imamura, F. A non-reductive N = 4 superconformal algebra
http://espace.library.uq.edu.au/view/UQ:271117
2012-03-22T12:08:27Z
Rasmussen, J. An open-access online question generator with fully worked solutions
http://espace.library.uq.edu.au/view/UQ:252289
Mathematics staff at The University of Queensland have created an electronic question and solution generator that covers a wide range of fundamental mathematical, statistical and quantitative skills. This open-access system allows teachers and/or students of all grades to create an unlimited number of questions covering over 100 topics, ranging from order of operations through to calculus and linear algebra. The beauty and originality of this flexible electronic framework is that fully worked solutions are also included. This paper outlines the process of developing and testing the question generator and discuss evidence of its effective implementation.2011-09-20T11:49:35Z
Jennings, Michael; Adams, Peter An optically actuated surface scanning probe
http://espace.library.uq.edu.au/view/UQ:298968
We demonstrate the use of an extended, optically trapped probe that is capable of imaging surface topography with nanometre precision, whilst applying ultra-low, femto-Newton sized forces. This degree of precision and sensitivity is acquired through three distinct strategies. First, the probe itself is shaped in such a way as to soften the trap along the sensing axis and stiffen it in transverse directions. Next, these characteristics are enhanced by selectively position clamping independent motions of the probe. Finally, force clamping is used to refine the surface contact response. Detailed analyses are presented for each of these mechanisms. To test our sensor, we scan it laterally over a calibration sample consisting of a series of graduated steps, and demonstrate a height resolution of ∼ 11 nm. Using equipartition theory, we estimate that an average force of only ∼ 140 fN is exerted on the sample during the scan, making this technique ideal for the investigation of delicate biological samples.2013-04-30T16:15:17Z
Phillips, D. B.; Gibson, G. M.; Bowman, R.; Padgett, M. J.; Hanna, S.; Carberry, D. M.; Miles, M. J.; Simpson, S. H. An optical trap experiment to demonstrate fluctuation theorems in viscoelastic media
http://espace.library.uq.edu.au/view/UQ:298973
2013-04-30T16:16:29Z
Carberry, D. M.; Baker, M. A. B.; Wang, G. M.; Sevick, E. M.; Evans, Denis J. An optimal design for screening trials
http://espace.library.uq.edu.au/view/UQ:222309
2010-11-24T13:47:18Z
Wang, Y. G.; Leung, D. H. Y. An opto-magneto-mechanical quantum interface between distant superconducting qubits
http://espace.library.uq.edu.au/view/UQ:335573
2014-07-29T00:40:44Z
Xia, Keyu; Vanner, Michael R.; Twamley, Jason A Note on Gittins Indices for Pharmaceutical Research
http://espace.library.uq.edu.au/view/UQ:222308
2010-11-24T13:47:13Z
Wang, Y. G.; Gittins, J. A note on Kerr/CFT and free fields
http://espace.library.uq.edu.au/view/UQ:269836
2012-03-14T11:41:00Z
Rasmussen, J. A note on the existence and uniqueness of a bounded mean-reverting process
http://espace.library.uq.edu.au/view/UQ:185157
2009-10-22T13:23:08Z
Lesmono, D.; Pollett, P. K.; Tonkes, E. J.; Burrage, K. A note on the Hopf-Stiefel function
http://espace.library.uq.edu.au/view/UQ:268226
We give a short elementary proof for a formula for the Hopf-Stiefel function that was found recently by Plagne via additive number theory.2012-02-23T15:59:48Z
Karolyi, Gyula A note on the path-discrepancy of trees
http://espace.library.uq.edu.au/view/UQ:267822
2012-02-17T16:14:18Z
Barany, I.; Karolyi, Gyula A novel approach for biomarker selection and the integration of repeated measure experiments from two platforms
http://espace.library.uq.edu.au/view/UQ:309712
2013-09-19T12:48:12Z
Liquet, B.; Le Cao, K.; Hocini, H.; Thiebaut, R. A novel breeding programme for improved growth in barramundi Lates calcarifer (Bloch) using foundation stock from progeny-tested parents
http://espace.library.uq.edu.au/view/UQ:251770
Rapid genetic gains for growth in barramundi (Lates calcarifer) appear achievable by starting a breeding programme using foundation stock from progeny tested broodstock. The potential gains of this novel breeding design were investigated using biologically feasible scenarios tested with computer simulation models. The design involves the production of a large number of full-sib families using artificial mating which are compared in common growout conditions. The estimated breeding values of their paternal parents are calculated using a binomial probit analysis to assess their suitability as foundation broodstock. The programme can theoretically yield faster rates of genetic gain compared to other breeding programmes for aquaculture species. Assuming a heritability of 0.25 for growth, foundation broodstock evaluated in two years had breeding values for faster growth ranging from 21% to 51% depending on the genetic diversity of stock under evaluation. As a comparison it will take between nine and twenty-two years to identify broodstock with similar breeding values in a contemporary barramundi breeding programme.2011-09-11T21:28:14Z
Macbeth, Gilbert Michael; Palmer, Paul John A novel protocol-authentication algorithm ruling out a man-in-the middle attack in quantum cryptography
http://espace.library.uq.edu.au/view/UQ:190441
In this work we review the security vulnerability of quantum cryptography with respect to "man-in-the-middle attacks" and the standard authentication methods applied to counteract these attacks. We further propose a modified authentication algorithm which features higher efficiency with respect to consumption of mutual secret bits.2009-12-18T13:12:19Z
Peev, M.; Nölle, M.; Maurhardt, O.; Lorünser, T.; Suda, M.; Poppe, A.; Ursin, R.; Fedrizzi, A.; Zeilinger, A. An overview of Calanus helgolandicus ecology in European waters
http://espace.library.uq.edu.au/view/UQ:112357
We review current knowledge and understanding of the biology and ecology of the calanoid copepod Calanus helgolandicus in European waters, as well as provide a collaborative synthesis of data from 18 laboratories and 26 sampling stations in areas distributed from the northern North Sea to the Aegean and Levantine Seas. This network of zooplankton time-series stations has enabled us to collect and synthesise seasonal and multi-annual data on abundance, body size, fecundity, hatching success and vertical distribution of C helgolandicus. An aim was to enable comparison with its congener Calanus finmarchicus, which has been studied intensively as a key component of European and north east Atlantic marine ecosystems. C finmarchicus is known to over-winter at depth, whereas the life-cycle of C helgolandicus is less well understood. Overwintering populations of C helgolandicus have been observed off the Atlantic coast between 400 and 800 m, while in the Mediterranean there is evidence of significant deep-water populations at depths as great as 4200 m. The biogeographical distribution of C helgolandicus in European coastal waters covers a wide range of habitats, from open ocean to coastal environments, and its contribution to mesozooplankton biomass ranges from 6 % to 93 %. Highest abundances were recorded in the Adriatic and off the west coast of Spain. C helgolandicus is generally found in 9-20 degrees C water, with maximum abundances from 13-17 degrees C. In contrast, C finmarchicus is found in cooler water between 0 and 15 degrees C, with peak abundances from 0 to 9 degrees C. As water has warmed in the North Atlantic over recent decades, the range of C. helgolandicus and its abundance on the fringes of its expanding range have increased. This review will facilitate development of population models of C. helgolandicus. This will not only help answer remaining questions but will improve our ability to forecast future changes, in response to a warming climate, in the abundance and distribution of this important species. (c) 2005 Elsevier Ltd. All rights reserved.2007-09-19T17:31:53Z
Bonnet, Delphine; Richardson, Anthony; Harris, Roger; Hirst, Andrew; Beaugrand, Gregory; Edwards, Martin; Ceballos, Sarah; Diekman, Rabea; Lopez-Urrutia, Angel; Valdes, Luis; Carlotti, François; et al. Antireflection coating for improved optical trapping
http://espace.library.uq.edu.au/view/UQ:170393
An antireflection coating improves the trapping of high-index particles in optical tweezers by reducing the scattering force. This can allow the strong trapping of high-index particles that cannot normally be trapped, and the use of lower numerical aperture objectives while still obtaining strong trapping. The improvement is not overly sensitive to the refractive index or thickness of the coating.2009-03-18T10:33:02Z
Hu, Ying; Nieminen, Timo A.; Heckenberg, Norman R.; Rubinsztein-Dunlop, Halina Anti-self-dual connections and their related flow on 4-manifolds
http://espace.library.uq.edu.au/view/UQ:163424
In this paper, we establish the existence of the maximal time for a smooth solution to the anti-self-dual (ASD) flow in vector bundles over a 4-dimensional compact Riemannian manifold M and present a different proof of the Taubes’ existence theorem on anti-self-dual connections on 4-manifolds.2009-02-09T14:00:14Z
Hong, M.-C.; Yu, Z.